Inhalation:Inhalation of vapors and mist of dicyclohexylmethane-4,
4’-diisocyanate at concentrations above the TLV can irritate the mucous
membranes in the respiratory tract causing runny nose, sore throat, coughing,
chest discomfort, shortness of breath and reduced lung function.Exposure well above the intended TLV may
lead to bronchitis, bronchial spasm edema (fluid in the lungs).These effects are usually reversible.
Chemical hypersensitive pneumonitis, with flu symptoms has been reported.

Skin:Contact will cause irritation, reddening, swelling, rash, scaling or
blistering. Dicyclohexylmethane-4, 4’-diisocyanate is also a potent skin
sensitizer. Experience indicates that direct skin contact is the route of
exposure most likely to cause sensitization.Once sensitized, an individual may react even to airborne levels below
the TLV with the following symptoms: itching and tingling of the earlobes and
neck, rash, hives, swelling of the arms and legs or other symptoms common to
allergic dermatitis.These symptoms may
be immediate or delayed several hours.

Ingestion:May have corrosive effects on the linings of the mouth and stomach:
symptoms can include sore throat, abdominal pain, nausea, vomiting and
diarrhea.

Carcinogenicity:
IARC, NTP, and OSHA do not list any components of this product as a carcinogen.

Inhalation: As a result of previous
repeated overexposures or a single large dose, certain individuals will develop
isocyanate sensitization (chemical asthma) which will cause them to react to a
later exposure to isocyanates at levels well below the TLV.These symptoms, which include: chest
tightness, wheezing, cough, shortness of breath or asthmatic attack, could be
immediate or delayed up to several hours after exposure.Similar to many non-specific asthmatic responses,
there are reports that once sensitized an individual can experience these
symptoms upon exposure to other irritants.Sensitization may be either temporary or permanent.

Skin:Contact will cause irritation, reddening, swelling, rash, scaling or
blistering.These symptoms can result
from contact with very small amounts of liquids or vapor exposure to
individuals that have developed a skin sensitization.

After first aid, get appropriate in-plant,
paramedic, or community medical support.

Section 5
- Fire-Fighting Measures

Flash Point: 369°F (187.2°C)

Flash Point Method: PMCC

LEL: Not Established

UEL: Not Established

Flammability Classification: Non-Flammable

Extinguishing
Media: Water Fog, Dry Chemical, and Carbon Dioxide Foam

Unusual
Fire or Explosion Hazards: Hazardous decomposition products may be
formed.Avoid water contamination in
closed containers or confined areas as exothermic heat and carbon dioxide can
evolve.

Fire-Fighting
Instructions: Fire fighters should wear self-contained breathing
apparatus.Do not release runoff from
fire control methods to sewers or waterways.

Fire-Fighting
Equipment: Because fire may produce toxic thermal decomposition products,
wear a self-contained breathing apparatus (SCBA) with a full facepiece operated
in pressure-demand or positive-pressure mode.

Section 6
- Accidental Release Measures

Spill /Leak
Procedures: Only properly protected personnel should remain in the spill
area; dike and contain spill; absorb or scrape up excess into suitable
container for disposal; wash area with dilute ammonia solution.Stop or reducedischarge if it can be done safely.

Ventilation:
Provide general or local exhaust ventilation systems to maintain airborne
concentrations below OSHA PELs (Sec. 2). Local exhaust ventilation is
preferred because it prevents contaminant dispersion into the work area by
controlling it at its source.

This
product contains the following chemicals that are subject to release reporting
requirements under section 313 of

SARA Title III.None

Section 15
- Regulatory Information(continued)

SARA EHS (Extremely
Hazardous Substance) (40 CFR 355): None

TSCA Inventory Status (40 CFR710): All
components of this formulation are listed in the TSCA Inventory.

State Regulations:

California Proposition 65: This product does not intentionally
contain any chemicals, which have been identified by the state of California to
cause cancer, birth defects or other reproductive harm.

Massachusetts
Right To Know, Substance List:

Special
Hazardous Substances (>0.01%)

Chemical
NameCAS
#%
by Weight

None

Hazardous
Substances (>1.00%)

Chemical
NameCAS
#%
by Weight

Dicyclohexylmethane-4, 4’-diisocyanate5124-30-185.0 Max

Pennsylvania
Right To Know, Substance List:

Special
Hazardous Substances (>0.01%)

Chemical
NameCAS
#%
by Weight

None

Hazardous
Substances (>1.00%)

Chemical
NameCAS
#%
by Weight

Dicyclohexylmethane-4, 4’-diisocyanate5124-30-185.0 Max

16 - Other
Information

Prepared By: Dominick J. Finocchio

Title:Technical Director

Disclaimer:
The information contained in this MSDS is considered accurate as of the version
date.However, no warranty is expressed
or implied regarding the accuracy of the data.Since the use of this product is not within the control of Smooth-On
Inc., it is the user’s obligation to determine the suitability of the product
for its intended application and assumes all risk and liability for its safe
use.